Study on Preparation of Levulinic Acid by Acid Hydrolysis of Rice Straw

Levulinic acid was prepared by the method of highpressure acid hydrolysis of rice straw.The purity of levulinic acid was determined by gas chromatography.The influences of the reaction temperature,reaction time,solid-liquid ratio and acid concentration on the yield of levulinic acid were investigated.The single factor experimental results showed that when the temperature was 170 ℃,the solid-liquid ratio was 1∶10 and the acid concentration was 5 % by mass,the yield of levulinic acid was 24.35 %.At this optimal hydrolysis condition,no cellulose or pentosan was detected in the hydrolyzed residue.